Teasered in a Twitter post a few weeks ago, i was able to create the new mangroves and implement them into my worlds.
Fun fact: My mangroves came out 2 days earlier than the official snapshot with the new biome. Since Mojang added first the blocks and then the biome.. can i call here: first? haha
In the upcoming weeks, I will further look into improving this area and also adding new swamp sub-genres. So far I'm really satisfied with how well the transition turned out!
If you have more suggestions for improvement, let me know!